I've got about 25lbs of base rock and 10lbs of shelf rock for a 2x2 cube. I want to have alot of flat over hanging areas so I need something that can hold together strong. All the rock is dry and I will be putting it together outside of the water. What is a good cement to use. Seems like everything I read is half good half bad reviews. The 3 I have it between is Marco, stone fix, and nyos reef cement unless there is something else.